Stainless Steel Reinforcement Bars...

Stainless Steel Reinforcement Bars  Premature deterioration of reinforced concrete structures is a serious problem worldwide due to corrosion of the embedded steel. The affected reinforced concrete structures are mainly those which are situated in an aggressive marine environment, and road bridges to which de-icing salts are applied during winter periods. Corrosion of the steel is initiated when the chloride ion from the salt (sodium chloride) permeates through the concrete to the level of the reinforcement steel which is attacked on contact. The solution, now favoured by highways authorities in Europe and North America, is to use stainless steel for rebars that has proven to be highly resistant to chloride ion. Stainless steel reinforcement bars or simply called stainless steel rebars are more expensive than carbon steel rebars. They do not corrode for the design life of the structure which is normally taken as 125 years in the case of highway bridges. The reductions on ongoing repair and maintenance costs that are usually incurred in case of carbon steel rebars are significant. Environmentally, the reduced downtime for maintenance and repair impacts upon traffic flow and disruption thus making the use of stainless steel rebars highly attractive. Only a small percentage of the steel rebars needs to be stainless steel to achieve a significant increase in durability. Stainless steel rebars can readily be used with conventional carbon steel rebars in reinforced concrete without causing galvanic effects. Stainless steel rebars are cost effective when used in the elements of the concrete structure at highest risk to corrosion (with carbon steel used for the balance of the reinforcement) or, where repair is difficult and expensive. Further by using stainless steel rebars, the concrete mix can also be simplified as it not necessary to provide passivity to the steel...